Digital tracking and focus servo system with a DSP architecture

Inactive Publication Date: 2002-07-25
RPX CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The need for compact data storage is explosively increasing.
Regardless of the cause being provided for relative movement between optical components, such an approach, while perhaps useful for accommodating relatively large or massive components, presents certain disadvantages for more compact usage.
These disadvantages include a requirement for large form factors, the cost associated with establishing and maintaining optical alignment between components which must be made moveable with respect to one an

Method used

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  • Digital tracking and focus servo system with a DSP architecture
  • Digital tracking and focus servo system with a DSP architecture
  • Digital tracking and focus servo system with a DSP architecture

Examples

Experimental program
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Embodiment Construction

of an Optical Drive Controller

[0076] FIG. 3A shows a block diagram of an embodiment of controller 106 according to the present invention. Optical signals are received from OPU 103 (see FIGS. 2B-2D). As discussed above with FIGS. 2B, 2C and 2D, some embodiments of OPU 103 include two detectors with detector 225 including detectors 231, 232, and 233 for providing detector signals A.sub.R, E.sub.R, and C.sub.R, respectively, and detector 226 having detectors 234, 235 and 236 providing detector signals B.sub.R, F.sub.R, and D.sub.R, respectively. Further, some embodiments of OPU 103 include a laser power detector 250 mounted to receive reflected light from an annular reflector 252 positioned on periscope 210, as discussed above, and therefore provides a laser power signal LP.sub.R as well.

[0077] Detector signals received from OPU 103 are typically current signals. Therefore, the detector signals from OPU 103 are converted to voltage signals in a preamp 310. Preamp 310 includes a transim...

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Abstract

A system with a plurality of servo algorithms executing on a digital signal processor is presented. The digital signal processor receives a sensor interrupt, indicating availability of digitized data from optical sensors, and decides which of a plurality of servo algorithms to service in response to the interrupt. In some embodiments, the plurality of servo algorithms includes a tracking servo algorithm. In some embodiments, the plurality of servo algorithms includes a focus servo algorithm. In some embodiments, multi-track seek operations or one-track jump operations can also be serviced during the interrupt period.

Description

[0001] This application is related to provisional application Serial No. 60 / 264,351, entitled "Optical Disk Drive Servo System," by Ron J. Kadlec, Christopher J. Turner, Hans B. Wach, and Charles R. Watt, from which this application claims priority, herein incorporated by reference in its entirety.CROSS-REFERENCE TO CD-ROM APPENDIX[0002] CD-ROM Appendix A, which is a part of the present disclosure, is a CD-ROM appendix consisting of twenty two (22) text files. CD-ROM Appendix A is a computer program listing appendix that includes a software program executable on a controller as described below. The total number of compact disks including duplicates is two. Appendix B, which is part of the present specification, contains a list of the files contained on the compact disk. The attached CD-ROM Appendix A is formatted for an IBM-PC operating a Windows operating system.[0003] A portion of the disclosure of this patent document contains material which is subject to copyright protection. Th...

Claims

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Application Information

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IPC IPC(8): G11B7/085G11B7/09G11B7/095G11B7/12G11B7/13G11B7/135G11B19/28
CPCG11B7/08505G11B7/08523G11B7/08529G11B7/08541G11B7/08576G11B7/09G11B7/0901G11B7/0912G11B7/0938G11B7/094G11B7/0941G11B7/0943G11B7/0946G11B7/0948G11B7/0953G11B7/0956G11B7/123G11B7/131G11B7/1356G11B19/28
Inventor KADLEC, RON J.TURNER, CHRISTOPHER J.
Owner RPX CORP
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